Coil and mounting therefor



Aug. 17, 1948. A. J. RUSCITO.

con, AND MOUNTING THEREFOR Filed Sept. 1, 1943 I 4 2 2 E M 7 @v i u m dA 5 & m 0 g 7 g 8 n fl lllw h z 2 H 1 A 1/ m Y B 24 a2 44 Fig. 3

A TTORNE Y Patented-Aug. 17, 1948 COIL AND MOUNTING THEREFOR Anthony J.Ruscito, Unadilla, N. Y., assignor to Bendix Aviation Corporation, NewYork, N. Y., a corporation of Delaware 6' Application September 1, 1943,Serial No. 500,780

1 Claim. (01. 171-209) This invention relates to electrical apparatusand more particularly to a coil adapted for use in ignition apparatus,such as magneto-generators, and means for mounting the same.

One of the objects of the present invention is to provide a novellyconstructed coil which may be readily and inexpensively manufactured andis yet sturdy, durable and electrically eflicient.

Another object is to provide a novel coil for'a magneto-generator or thelike which is so constructed as to facilitate electrical connectionsthereto.

Still another object is to provide a magnetogenerator or the likewherein the coil in .which current is magnetically induced is mounted inoperative relation to the stator poles in a novel and highly eflicientmanner.

A further object is to provide a novel induction coil for a magnetoelectric device or the like wherein the ground connection is effected ina novel way.

The above and further objects and novel features of the invention willmore fully appear from the following detailed description when the sameis read in connection with the accompanying drawings. It is to beexpressly understood, however, that the drawings are for the purpose ofillustration only and are not intended as a definition of the limits ofthe invention, referonce for this latter purpose being had primarily tothe appended claims.

In the drawings, wherein like reference characters refer to like partsthroughout the several views, I

Fig. 1 is a top plan view, with parts broken away, showing a portion ofthe casing of a magneto-generator or the like and one form of coilconstructed and mounted in the casing in accordance with the presentinvention:

.Fig. 2 is a detail view, partly in section and with parts broken away,of the apparatus of Fig. 1, the section being taken substantially online 2-2 of Fig. 1;

Fig. 3 is a sectional detail view of said coil, the

section being taken on line 3-3 of Fig. 1;

Fig. 4 is a sectional view of said coil taken on line 44 of Fig. 3;

Fig. 5 is a partial plan view of said coil, partly in section and withparts broken away, the section being taken on line 55 of Fig. 2;

Fig. 6 is a detail side elevation view, showing an outside plate orlamination of the coil core; and

Fig. '7 is a sectional view of said plate taken on line 'I-I of Fig. 6.

The single embodiment of the invention illus- -trated in theaccompanying drawings includes.

by way of example, a coil mounted in the casing of a magneto which isadapted for supplying relatively low voltage current to an internalcombustion engine ignition system of the low voltage distribution type.The magneto may be of the rotating magnet or any other suitable typewellknown in the art. Since magnetos per se are so v well understood bythose skilled in the art, it is believed to be unnecessary to show allof the details of the complete magneto structure. In the moderncommercial form of magneto, the stator poles I0, 10 are laminated andcast into the walls of the magneto casing for cooperation with arotating magnet or flux distributor which cooperates with a stationary,permanent magnet in a manner well understood in the art.

The novel, simplified coil contemplated by the invention comprises anovelly constructed metallic core l2, which consists of a plurality ofthin laminations I3 and a pair of slightly thicker outside laminationsor side plates H and I. Said laminations and plates may, in the interestof greater mechanical strength and rigidity, be secured together by aplurality of rivets ii. The latter may, however, be omitted in thepresent novel construction in order to obviate undesirable eddy currentswithin the core itself if increased electrical efficiency is important.For a purpose to more fully appear hereafter, each of the outsidelaminations or side plates I4 and I5 is provided adjacent the endsthereof with laterally projecting ears or fastening lugs l1, which maybe integral with or otherwise suitably secured to said plates. The lowerfaces I8 of said lugs, as I viewed in the drawings, are preferably in aplane parallel to but slightly above the lower edges of the centralportions of plates I4, I 5 and hence, above the lower face I9 of theassembled core II. For the purpose of facilitating the grounding of oneend of the coil winding,,to be hereinafter described, and provide adurable and positive ground connection, side plate i4 is providedintermediate its ends with a laterally extending projection 20. Thisprojection may be soldered, welded, riveted or secured in any othersuitable manner to plate or lamination I4 in the form indicated in Fig.7, that is, as a separate piece, or the same may be stamped or pressedout of the plate itself and, hence, be integral therewith.

Surrounding core l2 and serving as means either with or without rivetsl6 for holding the laminations l3, l4, [5 of core I2 in assembledrelation is a unitary spool 2| of molded insulating material. Said spoolis preferably molded onto the coil core so that these two parts are, ineifect, a unitary'structure. Said spool consists of end flanges 22, 23and a central portion 24 completely surrounding the central portion ofcore I! and preferably having a continuously curved periphery orcircumferential surface, which facilitates installation of the coilwinding thereon without necessitating any sharp bending of the wire andwithout leaving any substantial air spaces. Ears or lugs iii are outsidethe end flanges of spool 2i,-whereas projection is preferably embeddedin flange 32 (Fig. 1) and a hollow metallic rivet 25 extends throughsaid flange and projection in good electrical contact with the latter.The outer face of projection 22 is preferably flush with the outer faceof flange 22, as shown in Fig. 1. Said projection, however, need not beembedded in the flange but may be secured to or integral with any partof lamination it which extends beyond said flange, such as the lug ill,for example.

The upper central portion of flange 23 is preferably provided with anexternal boss 26 in which is embedded a metallic terminal 21. -Thelatter, as shown, has a threaded opening 28 therein for receiving ascrew adapted to electrically connect the end of an outgoing electricalconnection (not shown) to said terminal. The-molding 2! may be slotted.as at 29, to uncover a portion of the periphery of terminal 21 and thuspermit the connection-of one end of the coil winding'thereto by means ofsolder or other suitable fastening means. i

The coil winding 30 (Fig. 3) may be wound in anyv suitable known way onthe central portion 24 of spool 2|. In one suitable commercialembodiment, winding 30 consists of No. 14, single enameled, copper,magnet wire. The surface of spool portion 24 is preferably covered witha thin layer 31 of impregnated fabric tape or the like, and a similarprotective coating 32 may be provided about the periphery of winding 30.Before the winding of the coil is begun, a bare end of the wire isextended through hollow rivet 25 and soldered or otherwise suitablysecured to lug 20 for insuring a good electrical connection. After thewinding is completed, the other end 33 of the wire is laid in slot 29and soldered to terminal member 21.

The finished coil may then be securely and rigidly mounted in casing iiin a novel manner which insures good magnetic contact between core l2and stator poles i0, iii. The mounting also makes loosening of andconsequent damage to the coil structure by vibration most unlikely. As

vided for this latter purpose. Bolts or screws 34 also provide a goodand positive electrical connection between plam or lamination i4 andcasing ii and, hence. between the latter and the coil winding to groundthe same.

There is thus provided a novelly constructed coil for an ignition systemor the like, which is of a simple and sturdy nature and which willoperate efiiciently and effectively over long periods of use and besubstantially unaffected by vibration and shock. Additionally, the novelstructure of the coil renders it possible to secure the same to itsmounting or support in a novel and effective manner whereby the coilcore and flux carrying stator poles cooperate to insure an efiicientflow of magnetic flux through the coil winding without the presence ofeddy currents, such as may be set up through-the fastening means ofstructures heretofore known. The present invention also embodies noveland advantageous means'for making the necessary electrical connectionsto the coil winding, said means making it possible to quickly remove thecoil from its mounting for replacement,'inspection or repair. The novelcoil structure provided is also made up of a minimum number of partsassembled in a novel manner to provide as nearly as possible a rigid,unitary structure which may be readily and inexpensively manufactured.

Although only a single embodiment of the invention has been illustratedand described in the foregoing specification, it is to be expresslyundershown, the lower faces 19 of the ends of core 12 are placed inengagement with the upper ends of stator poles l0, l0 which are flushwith the adjacent surface of casing ii. A screw or stud bolt 34 is thenextended through the opening in each of the ears or lugs ii and threadedinto tapped recesses in casing ii. Since the faces i8 of lugs I! areslightly above the adjacent surfaces of housing ii when faces iii of thecoil core .engage pole pieces i0, ID, the tightening of screws 34'wilispring said lugs downwardly and insure firm contact between the engagingsurfaces of the coil core and stator poles, thereby resulting inefficient transmission of the magnetic flux which flows through theseparts during operation of the magneto. The resiliency of the lugs i!will also tend to lock screws 34 against loosening by vibration. Ifdesired, additional locking means of any known kind may be prostood thatchanges may be made therein, particularly in the design and arrangementof the parts illustrated, without departing from the spirit and scope ofthe invention, as will now be clear to those skilled in the art. For adefinition of t e limits of the invention, reference is had primarily tothe appended claim.

What is claimed is:

In apparatus of the class described, a laminated metallic core, a spoolof insulating material molded around a central portion of said core,said spool consisting of end flanges extending radially from said coreand an intermediate portion having a continuously curved circumferentialsurface,

' faces of said lugs being in a plane parallel to and spaced a shortdistance from the plane of the corresponding surface of said core. I

ANTHONY J. RUSCITO.

REFERENCES crrEp The following references are of record in the file ofthis patent:

v UNITED STATES PATENTS Number Name Date 1,830,541 Harris Nov. 3, 19312,074,545 Harmon Mar. 23, 1937 2,110,321 Bongerd Mar. 8, 1938 2,259,229Schwarzman Oct. 14, 1941 2,286,234 Scott June 16, 1942 2,328,228 PearsonAug. 31, 1943

